1 Forces and motion

Question 1

What is the average speed formula?

Answer 1

speed = distance / time

Question 2

What units is distance measured in?

Answer 2

Metres

Question 3

What units is time measured in?

Answer 3

Seconds

Question 4

What units is speed measured in?

Answer 4

M/s

Question 5

What does displacement mean?

Answer 5

Distance in a specific direction

Question 6

What is a vector quantity?

Answer 6

Speed in a particular direction

Question 7

What are three examples of vector quantities?

Answer 7

Displacement, velocity, force

Question 8

What a scalar quantity?

Answer 8

A quantity that has no size or direction

Question 9

What are three examples of scalar quantities?

Answer 9

Mass, temperature, speed

Question 10

What is the acceleration formula?

Answer 10

final velocity - initial / time

Question 11

What are the units for velocity?

Answer 11

M/s

Question 12

What are the units for acceleration?

Answer 12

M/s^2

Question 13

How did Galileo measure acceleration?

Answer 13

By rolling a ball down a slope with 5 bells at different points, and seeing how long it took for them to reach the other bells, seeing how much they accelerate

Question 14

What does uniform acceleration mean?

Answer 14

That something accelerates in equal intervals of time

Question 15

How do you find acceleration in a velocity-time graph?

Answer 15

Increase of velocity / time taken

Question 16

What is the average velocity formula?

Answer 16

initial + final / 2

Question 17

How can you find the distance travelled in a velocity-time graph?

Answer 17

By calculating the distance of the shape under the graph

Question 18

What units are used to measure force?

Answer 18

Newtons (N)

Question 19

What is air resistance?

Answer 19

Something that tries to oppose the movement of objects through the air

Question 20

How do fast-moving animals stop a lot of air resistance?

Answer 20

By having a streamlined shape

Question 21

What is the unbalanced force?

Answer 21

Two forces acting on an object subtracted from each other (eg. push by the man - friction)

Question 22

How could there be no unbalanced force?

Answer 22

If the two forces on each side are equal

Question 23

What happens when there is no unbalanced force?

Answer 23

The object does not change the way it is moving

Question 24

What is friction?

Answer 24

The force that causes moving objects to slow down and finally stop

Question 25

Can forces change the shape of an object?

Answer 25

Yes

Question 26

What is an example of temporary change of shape?

Answer 26

Elastic bands; elastic materials do not break easily and return to their original shape when the force is removed

Question 27

What was Hooke's law?

Answer 27

The extension of a spring is directly proportional to the force exerted

Question 28

How can Hooke's law not apply to a spring?

Answer 28

If it is not stretched too far

Question 29

Do elastic bands obey Hooke's law?

Answer 29

No

Question 30

What is the formula for force?

Answer 30

Force = mass x acceleration

Question 31

What units is forced measured in?

Answer 31

Newtons (N)

Question 32

What units is mass measured in?

Answer 32

Kg

Question 33

What units is acceleration measured in?

Answer 33

M/s^2

Question 34

What is a negative acceleration?

Answer 34

Deceleration

Question 35

How do brakes on bicycles and cars work?

Answer 35

Increasing the friction between the rotating wheels and the body of the vehicle

Question 36

What is the thinking distance?

Answer 36

The distance a vehicle travels during the time it takes for the driver to realise they need to break

Question 37

What factors can affect the thinking distance?

Answer 37

Tired, under the influence of drugs or alcohol, poor visibility

Question 38

What is the braking distance?

Answer 38

The distance that an object travels from the time when the brakes are applied to the time when it comes to a complete stop

Question 39

What is the weight of an object?

Answer 39

The force that acts on it because of gravity

Question 40

What is the formula for weight?

Answer 40

Weight = mass x gravitational field strength

Question 41

What is gravitational field strength measured in?

Answer 41

N/kg

Question 42

What is a drag force?

Answer 42

The force that opposes an objects movement

Question 43

What is a drag coefficient?

Answer 43

A measure of how easily an object moves through the air

Question 44

What is terminal velocity?

Answer 44

When the weight and drag force acting on an object are equal

Question 45

What happens when an object reaches terminal velocity?

Answer 45

It will not get any faster or slower